@ONLINE{ALOHA,
author = {Rongas, T., Lensu, L., Kaarna, A., Kälviäinen, H.},
title = {{ALOHA}, Visual Learning Tool for Comprehending Program Structure in Introductory Programming },
year = {2005},
pages={5}, 
url = {www.it.lut.fi/eaeeie05/proceedings/p41.pdf},
}
